Schwarzenegger, the 21-year-old son of Arnold Schwarzenegger and Maria Shriver, has previously appeared in Grown Ups 2 and will soon be seen in Scout's Guide to the Zombie Apocalypse and Dear Eleanor. He joins Emma Roberts, Lea Michele, Abigail Breslin, Ariana Grande, Nick Jonas and Keke Palmer in the jam-packed ensemble show about a college campus that's plagued by a serial killer.